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target-i386: implement PKE for TCG 

Tested with kvm-unit-tests.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-02-09 14:14:28 +01:00
parent cf7cc9291b
commit 0f70ed4759
7 changed files with 110 additions and 5 deletions
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13
target-i386/cpu.c
View File

@ -361,7 +361,7 @@ static const char *cpuid_6_feature_name[] = {
CPUID_7_0_EBX_HLE, CPUID_7_0_EBX_AVX2,
CPUID_7_0_EBX_ERMS, CPUID_7_0_EBX_INVPCID, CPUID_7_0_EBX_RTM,
CPUID_7_0_EBX_RDSEED */
#define TCG_7_0_ECX_FEATURES 0
#define TCG_7_0_ECX_FEATURES (CPUID_7_0_ECX_PKU | CPUID_7_0_ECX_OSPKE)
#define TCG_APM_FEATURES 0
#define TCG_6_EAX_FEATURES CPUID_6_EAX_ARAT
#define TCG_XSAVE_FEATURES (CPUID_XSAVE_XSAVEOPT | CPUID_XSAVE_XGETBV1)
@ -2426,6 +2426,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*eax = 0; /* Maximum ECX value for sub-leaves */
*ebx = env->features[FEAT_7_0_EBX]; /* Feature flags */
*ecx = env->features[FEAT_7_0_ECX]; /* Feature flags */
if ((*ecx & CPUID_7_0_ECX_PKU) && env->cr[4] & CR4_PKE_MASK) {
*ecx |= CPUID_7_0_ECX_OSPKE;
}
*edx = 0; /* Reserved */
} else {
*eax = 0;
@ -2733,9 +2736,13 @@ static void x86_cpu_reset(CPUState *s)
if (env->features[FEAT_1_EDX] & CPUID_SSE) {
xcr0 |= XSTATE_SSE_MASK;
}
if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_MPX) {
xcr0 |= XSTATE_BNDREGS_MASK | XSTATE_BNDCSR_MASK;
for (i = 2; i < ARRAY_SIZE(x86_ext_save_areas); i++) {
const ExtSaveArea *esa = &x86_ext_save_areas[i];
if ((env->features[esa->feature] & esa->bits) == esa->bits) {
xcr0 |= 1ull << i;
}
}
if (env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE) {
cr4 |= CR4_OSFXSR_MASK | CR4_OSXSAVE_MASK;
}

6
target-i386/cpu.h
View File

@ -232,6 +232,7 @@
#define CR4_OSXSAVE_MASK (1U << 18)
#define CR4_SMEP_MASK (1U << 20)
#define CR4_SMAP_MASK (1U << 21)
#define CR4_PKE_MASK (1U << 22)
#define DR6_BD (1 << 13)
#define DR6_BS (1 << 14)
@ -260,6 +261,7 @@
#define PG_PSE_BIT 7
#define PG_GLOBAL_BIT 8
#define PG_PSE_PAT_BIT 12
#define PG_PKRU_BIT 59
#define PG_NX_BIT 63
#define PG_PRESENT_MASK (1 << PG_PRESENT_BIT)
@ -275,7 +277,8 @@
#define PG_ADDRESS_MASK 0x000ffffffffff000LL
#define PG_HI_RSVD_MASK (PG_ADDRESS_MASK & ~PHYS_ADDR_MASK)
#define PG_HI_USER_MASK 0x7ff0000000000000LL
#define PG_NX_MASK (1LL << PG_NX_BIT)
#define PG_PKRU_MASK (15ULL << PG_PKRU_BIT)
#define PG_NX_MASK (1ULL << PG_NX_BIT)
#define PG_ERROR_W_BIT 1
@ -284,6 +287,7 @@
#define PG_ERROR_U_MASK 0x04
#define PG_ERROR_RSVD_MASK 0x08
#define PG_ERROR_I_D_MASK 0x10
#define PG_ERROR_PK_MASK 0x20
#define MCG_CTL_P (1ULL<<8) /* MCG_CAP register available */
#define MCG_SER_P (1ULL<<24) /* MCA recovery/new status bits */

27
target-i386/fpu_helper.c
View File

@ -1184,6 +1184,11 @@ static void do_xsave_bndcsr(CPUX86State *env, target_ulong addr, uintptr_t ra)
cpu_stq_data_ra(env, addr + 8, env->bndcs_regs.sts, ra);
}
static void do_xsave_pkru(CPUX86State *env, target_ulong addr, uintptr_t ra)
{
cpu_stq_data_ra(env, addr, env->pkru, ra);
}
void helper_fxsave(CPUX86State *env, target_ulong ptr)
{
uintptr_t ra = GETPC();
@ -1257,6 +1262,10 @@ static void do_xsave(CPUX86State *env, target_ulong ptr, uint64_t rfbm,
target_ulong off = x86_ext_save_areas[XSTATE_BNDCSR_BIT].offset;
do_xsave_bndcsr(env, ptr + off, ra);
}
if (opt & XSTATE_PKRU_MASK) {
target_ulong off = x86_ext_save_areas[XSTATE_PKRU_BIT].offset;
do_xsave_pkru(env, ptr + off, ra);
}
/* Update the XSTATE_BV field. */
old_bv = cpu_ldq_data_ra(env, ptr + 512, ra);
@ -1339,6 +1348,11 @@ static void do_xrstor_bndcsr(CPUX86State *env, target_ulong addr, uintptr_t ra)
env->bndcs_regs.sts = cpu_ldq_data_ra(env, addr + 8, ra);
}
static void do_xrstor_pkru(CPUX86State *env, target_ulong addr, uintptr_t ra)
{
env->pkru = cpu_ldq_data_ra(env, addr, ra);
}
void helper_fxrstor(CPUX86State *env, target_ulong ptr)
{
uintptr_t ra = GETPC();
@ -1438,6 +1452,19 @@ void helper_xrstor(CPUX86State *env, target_ulong ptr, uint64_t rfbm)
}
cpu_sync_bndcs_hflags(env);
}
if (rfbm & XSTATE_PKRU_MASK) {
uint64_t old_pkru = env->pkru;
if (xstate_bv & XSTATE_PKRU_MASK) {
target_ulong off = x86_ext_save_areas[XSTATE_PKRU_BIT].offset;
do_xrstor_pkru(env, ptr + off, ra);
} else {
env->pkru = 0;
}
if (env->pkru != old_pkru) {
CPUState *cs = CPU(x86_env_get_cpu(env));
tlb_flush(cs, 1);
}
}
}
uint64_t helper_xgetbv(CPUX86State *env, uint32_t ecx)

22
target-i386/helper.c
View File

@ -676,6 +676,10 @@ void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4)
hflags |= HF_SMAP_MASK;
}
if (!(env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_PKU)) {
new_cr4 &= ~CR4_PKE_MASK;
}
env->cr[4] = new_cr4;
env->hflags = hflags;
@ -920,6 +924,24 @@ do_check_protect_pse36:
goto do_fault_protect;
}
if ((env->cr[4] & CR4_PKE_MASK) && (env->hflags & HF_LMA_MASK) &&
(ptep & PG_USER_MASK) && env->pkru) {
uint32_t pk = (pte & PG_PKRU_MASK) >> PG_PKRU_BIT;
uint32_t pkru_ad = (env->pkru >> pk * 2) & 1;
uint32_t pkru_wd = (env->pkru >> pk * 2) & 2;
if (pkru_ad) {
prot &= ~(PAGE_READ | PAGE_WRITE);
} else if (pkru_wd && (is_user || env->cr[0] & CR0_WP_MASK)) {
prot &= ~PAGE_WRITE;
}
if ((prot & (1 << is_write1)) == 0) {
assert(is_write1 != 2);
error_code |= PG_ERROR_PK_MASK;
goto do_fault_protect;
}
}
/* yes, it can! */
is_dirty = is_write && !(pte & PG_DIRTY_MASK);
if (!(pte & PG_ACCESSED_MASK) || is_dirty) {

2
target-i386/helper.h
View File

@ -198,6 +198,8 @@ DEF_HELPER_FLAGS_3(xsaveopt, TCG_CALL_NO_WG, void, env, tl, i64)
DEF_HELPER_FLAGS_3(xrstor, TCG_CALL_NO_WG, void, env, tl, i64)
DEF_HELPER_FLAGS_2(xgetbv, TCG_CALL_NO_WG, i64, env, i32)
DEF_HELPER_FLAGS_3(xsetbv, TCG_CALL_NO_WG, void, env, i32, i64)
DEF_HELPER_FLAGS_2(rdpkru, TCG_CALL_NO_WG, i64, env, i32)
DEF_HELPER_FLAGS_3(wrpkru, TCG_CALL_NO_WG, void, env, i32, i64)
DEF_HELPER_FLAGS_1(clz, TCG_CALL_NO_RWG_SE, tl, tl)
DEF_HELPER_FLAGS_1(ctz, TCG_CALL_NO_RWG_SE, tl, tl)

27
target-i386/misc_helper.c
View File

@ -609,3 +609,30 @@ void helper_debug(CPUX86State *env)
cs->exception_index = EXCP_DEBUG;
cpu_loop_exit(cs);
}
uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx)
{
if ((env->cr[4] & CR4_PKE_MASK) == 0) {
raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
}
if (ecx != 0) {
raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
}
return env->pkru;
}
void helper_wrpkru(CPUX86State *env, uint32_t ecx, uint64_t val)
{
CPUState *cs = CPU(x86_env_get_cpu(env));
if ((env->cr[4] & CR4_PKE_MASK) == 0) {
raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
}
if (ecx != 0 || (val & 0xFFFFFFFF00000000ull)) {
raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
}
env->pkru = val;
tlb_flush(cs, 1);
}

18
target-i386/translate.c
View File

@ -7322,7 +7322,23 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
}
gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 1);
break;
case 0xee: /* rdpkru */
if (prefixes & PREFIX_LOCK) {
goto illegal_op;
}
tcg_gen_trunc_tl_i32(cpu_tmp2_i32, cpu_regs[R_ECX]);
gen_helper_rdpkru(cpu_tmp1_i64, cpu_env, cpu_tmp2_i32);
tcg_gen_extr_i64_tl(cpu_regs[R_EAX], cpu_regs[R_EDX], cpu_tmp1_i64);
break;
case 0xef: /* wrpkru */
if (prefixes & PREFIX_LOCK) {
goto illegal_op;
}
tcg_gen_concat_tl_i64(cpu_tmp1_i64, cpu_regs[R_EAX],
cpu_regs[R_EDX]);
tcg_gen_trunc_tl_i32(cpu_tmp2_i32, cpu_regs[R_ECX]);
gen_helper_wrpkru(cpu_env, cpu_tmp2_i32, cpu_tmp1_i64);
break;
CASE_MODRM_OP(6): /* lmsw */
if (s->cpl != 0) {
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);